The Holy Trinity Orthodox Cathedral in Lutsk, Ukraine, forms part of the Bernardine Monastery and Church.

Removed from ownership of the Bernardine monks in the second half of the 19th century, the complex of buildings was donated to the Eastern Orthodox community of Lutsk.

In the 1870s, the church was reconstructed by adding a bell tower above the narthex and a central dome.

Documentary sources show that a church already existed in the 15th century, located on the hill near Lutsk.

An attempt by the organist to guard against theft resulted in the wooden church being burnt to the ground in 1696.

In the early 19th century, part of the monastery was used as a residence by Bishop Kasper Kazimierz Cieciszowski.

In 1853, the Bernardine monastery of Lutsk was closed and the monks of the Order left the city.

A central dome and a bell tower were added, symbolising Russian Orthodox architecture.

The complex consisting of the church and monastery represents a combination of Baroque and Classicist styles.